Driving of single-phase motors.



' K. SGHNETZLER. DRIVING or SINGLE PHASE MOTORS.

APPLICATION FILED FEB. 11. 1910 v Patented Dec. 10,1912.

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zinrvinaor SINGLE-PHASE Morons. 1

' To all whom it concern:

Be it known that I, KARL SCHNETZLER, a subjectv of the Emperor of Germany, and residing at Burghal denstrasse- 951, Baden, Switzerland, have invented certain new and useful Improvements in and Relating to the Driving of Single-Phase Motors, of which the following is a specification.

starting with a large torque have been at H. P. generally represents the utmost limit which large electricity works will allow as a single-phase connection. In order to make the connecting up of larger units'possible, it-has been proposed to convert the threephase current into a two-phase current by meansof a Scotttransformer, and to connect each phase of the two-phase system with an alternating current motor. In such a i case, two motors of equal size always belong together whichmotors are 4 mechanically coupled.

. The object of this invention is [to efiect an improved arrangement in which a spe-.

cial Scott transformer is not required.

The invention consists in an improved arrangement for driving s ngle phase-motors from three-phase mains in which current from part ofthe phases serves to drive one motor and current from the other part of the phases to drive the other, the two motors being suitably connected mechanically.

The invention also consists in the improvements'in and relating to the driving of single-phase motors froina three-phase system hereinafter described.

Figure 1 shows one manner of carryingthe invention ii to efiect, and Fig.2 shows a detail of a winding suitable for use .according to the invention.

Incarrying the invention into efiect according to the form illustrated in Fig. 1,

where by way ofexample two. repulsion motors a and b-are mounted on the same shaft 2' the motor a is driven from the two phases of the network aand d and the. motor 12' is driven from the remaining phase 6. This gives a Y or star connection, the terminalsI, II or III being connected to the I 65 three-phase mains which is connected I Application filed l ebruary 11, 1910. Serial No. 543,348.

- ternal coils and external coils.

Specification of Iietters fatent. Patented Dec, 10, 1912,

a three-phase generatorconventienally represented and denoted by. 9 one end of winding 6 leading'to the neutral point; If the number of turns-of the stator windings 0 and d of the motor a be equal to W between the terminals I'and II then the numberof turns of the stator winding of the -mot' t'h ldb e Z The use of single-phase motors, Wl11Cl1, or S on e u i h since adjustable motors of this type and sible equal resistance and have equal leak age. One method of obtaining this is shown in Fig. 2 in which the stator slots 7" each contain a coil of the windings 0 and d, but

various poles include an equal number of in- I claim as new and desire to secure by Letters Patent is 1. In dynamo electric machinery in com- In the form the winding'so and d possess as much as pos-.

the arrangement is suchthatthe coils of the bination two single phase motors including stators and rotors, windings on said stators,

alternating current three phase mains-and "electrical connections between two of said mains and the windings on one stator and between the other ma n and a terminal of a 3. In dynamo electric machinery in com- 'blIlQ/CIOIL two slngle phase motors including stators and rotors, a mechanical connection between said rotors, windings on said stators, alternating current three phase mains, electrical connections from the ends of-the winding on one stator to two of said mains, an electrical connection from'one end of the winding on the other stator to the third of winding on the other stator, together with V said mains and a further electrical CODING-.110

tion from theother end of this last said winding toanintermediate'point in the first winding; as set forth.

-' 4;. In dynamo electric machinery in com-t bination two single phase'inotors including stators and rotors, a mechelnieal connection between said rotors, windings on said stators, alternating current three phase mains,

electricaleonn'ect-ions from theends .of the said mains andmrfurther electrical connec- J tion from the Mother end of this last said 15- win(1ing,-the winding on the second stator comprising 0. 87 times the number of turns I winding to'an intermediate pointin the first of said windings to two of the alternating u of the winding on the first stator; as set current mains and from the other of said;

windings to the third main and toseid first windings; as and: for the purposes set forth. In testimony whereof, I sfiix my signature in presence of two Witnesses.

KARL SGHNETZLER Witnesses: CARL CUTBLER I If. BUNDY. 

